Better error handling of terminated channels when loading feed

app/build.gradle

@@ -183,7 +183,7 @@ dependencies {
 /** NewPipe libraries **/
     // You can use a local version by uncommenting a few lines in settings.gradle
     implementation 'com.github.TeamNewPipe:nanojson:1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751'
-    implementation 'com.github.TeamNewPipe:NewPipeExtractor:v0.21.4'
+    implementation 'com.github.TeamNewPipe:NewPipeExtractor:d4186d100b6c6dddfcf3cf4b004f5960a8bf441d'
 
 /** Checkstyle **/
     checkstyle "com.puppycrawl.tools:checkstyle:${checkstyleVersion}"

app/src/main/java/org/schabi/newpipe/local/feed/FeedFragment.kt

@@ -19,6 +19,7 @@
 
 package org.schabi.newpipe.local.feed
 
+import android.content.DialogInterface
 import android.content.Intent
 import android.os.Bundle
 import android.os.Parcelable
@@ -28,6 +29,7 @@ import android.view.MenuInflater
 import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
+import androidx.annotation.Nullable
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.edit
 import androidx.core.os.bundleOf
@@ -35,15 +37,24 @@ import androidx.core.view.isVisible
 import androidx.lifecycle.ViewModelProvider
 import androidx.preference.PreferenceManager
 import icepick.State
+import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
+import io.reactivex.rxjava3.core.Single
+import io.reactivex.rxjava3.disposables.CompositeDisposable
+import io.reactivex.rxjava3.schedulers.Schedulers
+import org.schabi.newpipe.NewPipeDatabase
 import org.schabi.newpipe.R
 import org.schabi.newpipe.database.feed.model.FeedGroupEntity
+import org.schabi.newpipe.database.subscription.SubscriptionEntity
 import org.schabi.newpipe.databinding.FragmentFeedBinding
 import org.schabi.newpipe.error.ErrorInfo
 import org.schabi.newpipe.error.UserAction
+import org.schabi.newpipe.extractor.exceptions.AccountTerminatedException
+import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException
 import org.schabi.newpipe.fragments.list.BaseListFragment
 import org.schabi.newpipe.ktx.animate
 import org.schabi.newpipe.ktx.animateHideRecyclerViewAllowingScrolling
 import org.schabi.newpipe.local.feed.service.FeedLoadService
+import org.schabi.newpipe.local.subscription.SubscriptionManager
 import org.schabi.newpipe.util.Localization
 import java.time.OffsetDateTime
 
@@ -51,6 +62,8 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
     private var _feedBinding: FragmentFeedBinding? = null
     private val feedBinding get() = _feedBinding!!
 
+    private val disposables = CompositeDisposable()
+
     private lateinit var viewModel: FeedViewModel
     @State
     @JvmField
@@ -158,6 +171,7 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
     }
 
     override fun onDestroy() {
+        disposables.dispose()
         super.onDestroy()
         activity?.supportActionBar?.subtitle = null
     }
@@ -243,9 +257,9 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
 
         oldestSubscriptionUpdate = loadedState.oldestUpdate
 
-        val loadedCount = loadedState.notLoadedCount > 0
+        val feedsNotLoaded = loadedState.notLoadedCount > 0
-        feedBinding.refreshSubtitleText.isVisible = loadedCount
+        feedBinding.refreshSubtitleText.isVisible = feedsNotLoaded
-        if (loadedCount) {
+        if (feedsNotLoaded) {
             feedBinding.refreshSubtitleText.text = getString(
                 R.string.feed_subscription_not_loaded_count,
                 loadedState.notLoadedCount
@@ -264,11 +278,64 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
             hideLoading()
             false
         } else {
-            showError(ErrorInfo(errorState.error, UserAction.REQUESTED_FEED, "Loading feed"))
+            if (errorState.error is FeedLoadService.RequestException) {
+                disposables.add(
+                    Single.fromCallable {
+                        NewPipeDatabase.getInstance(requireContext()).subscriptionDAO()
+                            .getSubscription(errorState.error.subscriptionId)
+                    }.subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe(
+                            {
+                                subscriptionEntity ->
+                                handleFeedNotAvailable(
+                                    subscriptionEntity,
+                                    errorState.error.cause?.cause
+                                )
+                            },
+                            { throwable -> throwable.printStackTrace() }
+                        )
+                )
+            } else {
+                showError(ErrorInfo(errorState.error, UserAction.REQUESTED_FEED, "Loading feed"))
+            }
             true
         }
     }
 
+    private fun handleFeedNotAvailable(
+        subscriptionEntity: SubscriptionEntity,
+        @Nullable cause: Throwable?
+    ) {
+        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireContext())
+        val isFastFeedModeEnabled = sharedPreferences.getBoolean(
+            getString(R.string.feed_use_dedicated_fetch_method_key), false
+        )
+        val builder = AlertDialog.Builder(requireContext())
+            .setTitle(R.string.feed_load_error)
+            .setPositiveButton(
+                R.string.unsubscribe,
+                DialogInterface.OnClickListener {
+                    _, _ ->
+                    SubscriptionManager(requireContext()).deleteSubscription(
+                        subscriptionEntity.serviceId, subscriptionEntity.url
+                    ).subscribe()
+                }
+            )
+            .setNegativeButton(R.string.cancel, DialogInterface.OnClickListener { _, _ -> })
+        if (cause is AccountTerminatedException) {
+            builder.setMessage(R.string.feed_load_error_terminated)
+        } else if (cause is ContentNotAvailableException && isFastFeedModeEnabled) {
+            builder.setMessage(R.string.feed_load_error_fast_unknown)
+                .setNeutralButton(R.string.feed_use_dedicated_fetch_method_disable_button) { _, _ ->
+                    sharedPreferences.edit {
+                        putBoolean(getString(R.string.feed_use_dedicated_fetch_method_key), false)
+                    }
+                }
+        }
+        builder.create().show()
+    }
+
     private fun updateRelativeTimeViews() {
         updateRefreshViewState()
         infoListAdapter.notifyDataSetChanged()

app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt

@@ -48,6 +48,7 @@ import org.schabi.newpipe.MainActivity.DEBUG
 import org.schabi.newpipe.R
 import org.schabi.newpipe.database.feed.model.FeedGroupEntity
 import org.schabi.newpipe.extractor.ListInfo
+import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException
 import org.schabi.newpipe.extractor.exceptions.ReCaptchaException
 import org.schabi.newpipe.extractor.stream.StreamInfoItem
 import org.schabi.newpipe.ktx.isNetworkRelated
@@ -162,7 +163,7 @@ class FeedLoadService : Service() {
     // Loading & Handling
     // /////////////////////////////////////////////////////////////////////////
 
-    private class RequestException(val subscriptionId: Long, message: String, cause: Throwable) : Exception(message, cause) {
+    public class RequestException(val subscriptionId: Long, message: String, cause: Throwable) : Exception(message, cause) {
         companion object {
             fun wrapList(subscriptionId: Long, info: ListInfo<StreamInfoItem>): List<Throwable> {
                 val toReturn = ArrayList<Throwable>(info.errors.size)
@@ -334,8 +335,9 @@ class FeedLoadService : Service() {
     private val errorHandlingConsumer: Consumer<Notification<Pair<Long, ListInfo<StreamInfoItem>>>>
         get() = Consumer {
             if (it.isOnError) {
-                var error = it.error!!
+                var maybeWrapper = it.error!!
-                if (error is RequestException) error = error.cause!!
+                val error = if (maybeWrapper is RequestException) maybeWrapper.cause!!
+                else maybeWrapper
                 val cause = error.cause
 
                 when {
@@ -345,6 +347,19 @@ class FeedLoadService : Service() {
                     error is IOException -> throw error
                     cause is IOException -> throw cause
                     error.isNetworkRelated -> throw IOException(error)
+
+                    cause is ContentNotAvailableException -> {
+                        // maybeWrapper is definitely a RequestException,
+                        // because this is an exception thrown in the extractor
+                        if (maybeWrapper is RequestException) {
+                            throw maybeWrapper
+                        } else {
+                            if (DEBUG) {
+                                Log.d(TAG, "Cause is ContentNotAvailableException, but maybeWrapper is not a RequestException")
+                            }
+                            throw cause // should never be the case
+                        }
+                    }
                 }
             }
         }

app/src/main/res/values/strings.xml

@@ -690,11 +690,16 @@
     <string name="feed_update_threshold_title">Feed update threshold</string>
     <string name="feed_update_threshold_summary">Time after last update before a subscription is considered outdated — %s</string>
     <string name="feed_update_threshold_option_always_update">Always update</string>
+    <string name="feed_load_error">Error loading feed</string>
+    <string name="feed_load_error_account_info">Could not load feed for \'%s\'.</string>
+    <string name="feed_load_error_terminated">The author\'s account has been terminated.\nNewPipe will not be able to load this feed in the future.\Do you want to unsubscribe from this channel?</string>
+    <string name="feed_load_error_fast_unknown">The fast feed mode does not provide more info on this.</string>
     <string name="feed_use_dedicated_fetch_method_title">Fetch from dedicated feed when available</string>
     <string name="feed_use_dedicated_fetch_method_summary">Available in some services, it is usually much faster but may return a limited amount of items and often incomplete information (e.g. no duration, item type, no live status).</string>
     <string name="feed_use_dedicated_fetch_method_enable_button">Enable fast mode</string>
     <string name="feed_use_dedicated_fetch_method_disable_button">Disable fast mode</string>
     <string name="feed_use_dedicated_fetch_method_help_text">Do you think feed loading is too slow? If so, try enabling fast loading (you can change it in settings or by pressing the button below).\n\nNewPipe offers two feed loading strategies:\n• Fetching the whole subscription channel, which is slow but complete.\n• Using a dedicated service endpoint, which is fast but usually not complete.\n\nThe difference between the two is that the fast one usually lacks some information, like the item\'s duration or type (can\'t distinguish between live videos and normal ones) and it may return less items.\n\nYouTube is an example of a service that offers this fast method with its RSS feed.\n\nSo the choice boils down to what you prefer: speed or precise information.</string>
+
     <string name="content_not_supported">This content is not yet supported by NewPipe.\n\nIt will hopefully be supported in a future version.</string>
     <string name="detail_sub_channel_thumbnail_view_description">Channel\'s avatar thumbnail</string>
     <string name="channel_created_by">Created by %s</string>